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How do you calculate the PH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of 1.0 M sodium lactate?

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(acid) = 1M x 75/100 = ??
(salt) = 1 M x 25/100 = ??
Plug into the Henderson-Hasselbalch equation.

4.34

the pKa of lactic acid is 3.86

pH=3.86+ log[(25x1.0)÷(75x1.0-3)]

pH = 3.38

the pKa of sodium lactate 3.78

pH=3.78+ log[(25x1.0)÷(75x1.0-3)]

pH = 3.30

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